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56
src/com/hellogithub/filter/SessionFilter.java
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56
src/com/hellogithub/filter/SessionFilter.java
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package com.hellogithub.filter;
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import jakarta.servlet.*;
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import jakarta.servlet.annotation.WebFilter;
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import jakarta.servlet.http.HttpServletRequest;
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import jakarta.servlet.http.HttpServletResponse;
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import jakarta.servlet.http.HttpSession;
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import java.io.IOException;
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/**
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* 过滤器
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*/
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@WebFilter("/system/*")// 过滤器所有的请求
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public class SessionFilter implements Filter {
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private String[] excludeUrls = new String[]{""}; //过滤器排除的请求url 格式:”/login“
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/**
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* 过滤器
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*
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* @param servletRequest
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* @param servletResponse
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* @param filterChain
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* @throws IOException,ServletException
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*/
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@Override
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public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
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// 从session获取到用户的会话信息 判断用户是否登录过
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HttpServletRequest httpServletRequest = (HttpServletRequest) servletRequest;
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HttpServletResponse httpServletResponse = (HttpServletResponse) servletResponse;
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String contextPath = httpServletRequest.getContextPath();
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// 定义一个数组 排除的请求
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for (int i = 0; i < excludeUrls.length; i++) {
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String excludeUrl = contextPath + excludeUrls[i];
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String requestURI = httpServletRequest.getRequestURI();
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if (excludeUrl.equals(requestURI)) {
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// 放行请求
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filterChain.doFilter(httpServletRequest, httpServletResponse);
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return;
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}
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}
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// 排除请求
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HttpSession session = httpServletRequest.getSession();
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Object user = session.getAttribute("user");
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if (user == null) {
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// 当前用户没有登录或者登录会话失效
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// 重定向到登录页面
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httpServletResponse.sendRedirect(contextPath + "/");
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return;
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}
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// 用户已经登录了 正常放行请求
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filterChain.doFilter(httpServletRequest, httpServletResponse);
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}
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}
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145
src/com/hellogithub/utils/JdbcUtils.java
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145
src/com/hellogithub/utils/JdbcUtils.java
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package com.hellogithub.utils;
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import java.io.InputStream;
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import java.sql.*;
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import java.util.Properties;
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/**
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* 工具类：jdbc
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* */
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public class JdbcUtils {
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private JdbcUtils() {
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}
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/**
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* 声明变量
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* driverClass : jdbc驱动
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* url : jdbc链接url
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* user : 数据库用户名
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* password : 数据库密码
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*/
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private static String driverClass;
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private static String url;
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private static String user;
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private static String password;
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/**
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*2.使用静态代码快 给jdbc变量赋值（读取config.properties）
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*/
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static {
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try {
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// 1.读取config.properties IO 路径 相对路径
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InputStream resourceAsStream = JdbcUtils.class.getClassLoader().
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getResourceAsStream("config.properties");
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// 2.赋值给我们声明好的变量
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Properties properties = new Properties();
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properties.load(resourceAsStream);
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driverClass = properties.getProperty("driverClass");
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url = properties.getProperty("url");
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user = properties.getProperty("user");
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password = properties.getProperty("password");
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// 3.注册驱动类
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Class.forName(driverClass);
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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/**
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* 3.封装连接方法
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*
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* @throws SQLException
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*/
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public static Connection getConnection() throws SQLException {
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Connection connection = DriverManager.getConnection(url, user, password);
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return connection;
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}
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/**
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* 3.封装释放连接方法 (重载)
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*
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* @param resultSet
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* @param statement
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* @param connection
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*/
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public static void closeConnection(ResultSet resultSet, Statement statement, Connection connection) {
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// 1.查询 释放连接 resultSet statement connection
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try {
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if (resultSet != null)
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resultSet.close();
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if (statement != null)
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statement.close();
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if (connection != null)
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connection.close();
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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/**
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* 4.增删改---释放jdbc资源
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*
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* @param statement
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* @param connection
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*/
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public static void closeConnection(Statement statement, Connection connection) {
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// 1.查询 释放连接 resultSet statement connection
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closeConnection(null, statement, connection);
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}
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/**
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* 5.开启事务
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*
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* @param connection
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* @throws SQLException
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*/
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public static void beginTransaction(Connection connection) throws SQLException {
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connection.setAutoCommit(false);
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}
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/**
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* 6.提交事务
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*
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* @param connection
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* @throws SQLException
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*/
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public static void commitTransaction(Connection connection) throws SQLException {
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connection.commit();
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}
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/**
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* 7.回滚事务
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*
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* @param connection
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*/
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public static void rollBackTransaction(Connection connection) {
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if (connection != null) {
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try {
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connection.rollback();
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} catch (SQLException e) {
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e.printStackTrace();
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}
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}
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}
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/**
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* 8.关闭事务
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*
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* @param connection
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*/
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public static void endTransaction(Connection connection) {
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if (connection != null) {
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try {
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connection.setAutoCommit(true);
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} catch (SQLException e) {
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e.printStackTrace();
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}
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}
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}
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}
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119
src/com/hellogithub/utils/RandomValidateCode.java
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119
src/com/hellogithub/utils/RandomValidateCode.java
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@@ -0,0 +1,119 @@
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package com.hellogithub.utils;
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import jakarta.servlet.http.HttpServletRequest;
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import jakarta.servlet.http.HttpServletResponse;
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import jakarta.servlet.http.HttpSession;
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import javax.imageio.ImageIO;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.util.Random;
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/**
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* 工具类: 生成随机验证码
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*/
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public class RandomValidateCode {
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public static final String RANDOMVALIDATECODE = "RandomValidateCode";// 放到session中的key
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private Random random = new Random();
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private String randString = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生的字符串
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private int width = 100;// 图片宽度
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private int height = 26;// 图片高度
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private int lineSize = 40;// 干扰线数量
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private int stringNum = 4;// 随机产生的字符数量
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/**
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* 获得字体
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*/
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private Font getFont() {
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return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
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}
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/**
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* 获得颜色
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*
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* @param bc
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* @param fc
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*/
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private Color getRandColor(int fc, int bc) {
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if (fc > 255)
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fc = 255;
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if (bc > 255)
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bc = 255;
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int r = fc + random.nextInt(bc - fc - 16);
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int g = fc + random.nextInt(bc - fc - 14);
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int b = fc + random.nextInt(bc - fc - 18);
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return new Color(r, g, b);
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}
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/**
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* 生成随机图片
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*
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* @param request
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* @param response
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*/
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public void getRandcode(HttpServletRequest request, HttpServletResponse response) {
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HttpSession session = request.getSession();
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// BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
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BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
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Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,该对象可以在图像上进行各种绘制操作
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g.fillRect(0, 0, width, height);
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g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));
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g.setColor(getRandColor(110, 133));
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// 绘制干扰线
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for (int i = 0; i <= lineSize; i++) {
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drowLine(g);
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}
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// 绘制随机字符
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String randomString = "";
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for (int i = 1; i <= stringNum; i++) {
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randomString = drowString(g, randomString, i);
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}
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session.removeAttribute(RANDOMVALIDATECODE);
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session.setAttribute(RANDOMVALIDATECODE, randomString);
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g.dispose();
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try {
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ImageIO.write(image, "JPEG", response.getOutputStream());// 将内存中的图片通过流动形式输出到客户端
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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/**
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* 绘制字符串
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*
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* @param g
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* @param randomString
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* @param i
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*/
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private String drowString(Graphics g, String randomString, int i) {
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g.setFont(getFont());
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g.setColor(new Color(random.nextInt(101), random.nextInt(111), random.nextInt(121)));
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String rand = getRandomString(random.nextInt(randString.length()));
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randomString += rand;
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g.translate(random.nextInt(3), random.nextInt(3));
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g.drawString(rand, 13 * i, 16);
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return randomString;
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}
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/**
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* 绘制干扰线
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*
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* @param g
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*/
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private void drowLine(Graphics g) {
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int x = random.nextInt(width);
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int y = random.nextInt(height);
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int xl = random.nextInt(13);
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int yl = random.nextInt(15);
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g.drawLine(x, y, x + xl, y + yl);
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}
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/**
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* 获取随机的字符
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*
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* @param num
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*/
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public String getRandomString(int num) {
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return String.valueOf(randString.charAt(num));
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}
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}
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